The caecilians are an order (Gymnophiona) o amphibians that superficially resemble yirdworms or snakes. Thay maistly live hidden in the grund, makin them the least familiar order o amphibians. Aw extant caecilians an thair closest fossil relatives are grooped as the clade Apoda. Thay are maistly distributit in the tropics o Sooth an Central Americae, Africae, an Sooth Asie. The diets o caecilians are nae well kent.